Type the correct answer in each box spell all words correctly.
, and the part labeled b is a
the part labeled a is a

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

i think that it is plants

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.